drivers/clk/pxa/clk-pxa.c

Source file repositories/reference/linux-study-clean/drivers/clk/pxa/clk-pxa.c

File Facts

System
Linux kernel
Corpus path
drivers/clk/pxa/clk-pxa.c
Extension
.c
Size
6802 bytes
Lines
252
Domain
Driver Families
Bucket
drivers/clk
Inferred role
Driver Families: implementation source
Status
source implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

struct pxa_clk {
	struct clk_hw hw;
	struct clk_fixed_factor lp;
	struct clk_fixed_factor hp;
	struct clk_gate gate;
	bool (*is_in_low_power)(void);
};

#define to_pxa_clk(_hw) container_of(_hw, struct pxa_clk, hw)

static unsigned long cken_recalc_rate(struct clk_hw *hw,
				      unsigned long parent_rate)
{
	struct pxa_clk *pclk = to_pxa_clk(hw);
	struct clk_fixed_factor *fix;

	if (!pclk->is_in_low_power || pclk->is_in_low_power())
		fix = &pclk->lp;
	else
		fix = &pclk->hp;
	__clk_hw_set_clk(&fix->hw, hw);
	return clk_fixed_factor_ops.recalc_rate(&fix->hw, parent_rate);
}

static const struct clk_ops cken_rate_ops = {
	.recalc_rate = cken_recalc_rate,
};

static u8 cken_get_parent(struct clk_hw *hw)
{
	struct pxa_clk *pclk = to_pxa_clk(hw);

	if (!pclk->is_in_low_power)
		return 0;
	return pclk->is_in_low_power() ? 0 : 1;
}

static const struct clk_ops cken_mux_ops = {
	.determine_rate = clk_hw_determine_rate_no_reparent,
	.get_parent = cken_get_parent,
	.set_parent = dummy_clk_set_parent,
};

void __init clkdev_pxa_register(int ckid, const char *con_id,
				const char *dev_id, struct clk *clk)
{
	if (!IS_ERR(clk) && (ckid != CLK_NONE))
		pxa_clocks[ckid] = clk;
	if (!IS_ERR(clk))
		clk_register_clkdev(clk, con_id, dev_id);
}

int __init clk_pxa_cken_init(const struct desc_clk_cken *clks,
			     int nb_clks, void __iomem *clk_regs)
{
	int i;
	struct pxa_clk *pxa_clk;
	struct clk *clk;

	for (i = 0; i < nb_clks; i++) {
		pxa_clk = kzalloc_obj(*pxa_clk);
		if (!pxa_clk)
			return -ENOMEM;
		pxa_clk->is_in_low_power = clks[i].is_in_low_power;
		pxa_clk->lp = clks[i].lp;
		pxa_clk->hp = clks[i].hp;
		pxa_clk->gate = clks[i].gate;
		pxa_clk->gate.reg = clk_regs + clks[i].cken_reg;
		pxa_clk->gate.lock = &pxa_clk_lock;
		clk = clk_register_composite(NULL, clks[i].name,
					     clks[i].parent_names, 2,
					     &pxa_clk->hw, &cken_mux_ops,
					     &pxa_clk->hw, &cken_rate_ops,
					     &pxa_clk->gate.hw, &clk_gate_ops,
					     clks[i].flags);
		clkdev_pxa_register(clks[i].ckid, clks[i].con_id,
				    clks[i].dev_id, clk);
	}
	return 0;
}

void __init clk_pxa_dt_common_init(struct device_node *np)
{
	of_clk_add_provider(np, of_clk_src_onecell_get, &onecell_data);
}

void pxa2xx_core_turbo_switch(bool on)
{
	unsigned long flags;
	unsigned int unused, clkcfg;

Annotation

Implementation Notes